Promise is synchronous or asynchronous in node js

Question

I have lot of confusion in promise. It\'s a synchronous or asynchronous ?

return new Promise (function(resolved,reject){
    //sync or async? 
});
         


        

Answer 1

This code makes it clearer:

        console.log("0");
        new Promise((resolve, reject) => {
          console.log("1");
          resolve();
        }).then(() => {
          console.log("2");
        });
        console.log("3");

The code prints: 0 1 3 2 So, then runs asynchronously while the main call back function runs synchronously.